Alumni
Katrina Sliwa Michel Devoret 
Minimizing Effects Detrimental to the Heisenberg BackAction of Qubit Measurements with Parametric Amplifiers The quantum backaction of the measurement apparatus arising from the Heisenberg uncertainty principle is both a fascinating phenomenon and a powerful manipulation tool. Unfortunately, there are other effects which may overwhelm the Heisenberg backaction. This thesis focuses on two effects arising in the dispersive measurement of superconducting qubits made with two commonly used ultralownoise parametric amplifiers, the Josephson bifurcation amplifier (JBA) and the Josephson parametric... more 

William Smith Corey O'Hern 
Senior Software Engineer Datadog Modeling Diffusion and Motion in Cells at the Molecular Level Due to the complexity inherent in biological systems, many particles involved exhibit complicated spatiotemporal dynamics that go beyond the standard models of diffusion of molecules and dynamics of polymers. Here, we investigate two examples of this: the dynamics of intrinsically disordered proteins, and the diffusion of a probe particle in a bacterial cell. Intrinsically disordered proteins (IDPs) are a class of proteins that do not possess welldefined threedimensional ... more 
Jeffrey Ammon David DeMille 
Progress towards a measurement of nuclearspindependent parity violation in diatomic molecules Nuclearspindependent parity violation (NSDPV) effects arise from exchange of the Z boson between electrons and the nucleus, and from interaction of electrons with the nuclear anapole moment (a parityodd magnetic moment induced by electroweak interactions within the nucleus). These effects cause a mixing of oppositeparity levels in atoms and molecules, where the size of the mixing is inversely proportional to the energy difference of the mixed levels. We study NSDPV effects... more 

Camille Avestruz Daisuke Nagai 
KICP Fellow Kavli Institute for Cosmological Physics at the University of Chicago Modeling Galaxy Cluster Outskirts with Cosmological Simulations The observational study of galaxy cluster outskirts is a new territory to probe the thermodynamic and chemical structure of the Xray emitting intracluster medium (ICM) and the intergalactic medium (IGM). Cluster outskirts are particularly important for modeling the SunyaevZel’dovich effect, which is sensitive to hot electrons at all radii and has been used to detect hundreds of galaxy clusters to highredshift (z<1) with recent microwave cluster surveys such as ACT, Planck, and SPT.... more 

Barry Bradlyn Nicholas Read 
Assistant Professor University of Illinois at UrbanaChampaign Linear response and Berry curvature in twodimensional topological phases In this thesis we examine the viscous and thermal transport properties of chiral topological phases, and their relationship to topological invariants. We start by developing a Kubo formalism for calculating the frequency dependent viscosity tensor of a general quantum system, both with and without a uniform external magnetic field. The importance of contact terms is emphasized. We apply this formalism to the study of... more 

Faustin Carter Daniel Prober 
Physicist HRL Laboratories A transitionedgesensorbased instrument for the measurement of individual He2* excimers in a superfluid 4He bath at 100 mK This dissertation is an account of the first calorimetric detection of individual He2* excimers within a bath of superfluid 4He. When superfluid helium is subject to ionizing radiation, diatomic He molecules are created in both the singlet and triplet states. The singlet He2* molecules decay within nanoseconds, but due to a forbidden spinflip the triplet molecules have a relatively long lifetime of 13 seconds in superfluid He. When He2* molecules decay, they emit a ~15 eV photon. Nearly all... more 

Nathan Cooper Volker Werner 
Deceased Structure of A = 76 Nuclei and FastTiming Studies of the RareEarth Region Photon strength of nuclei has been a topic of recent intrigue due to postulated exotic modes of excitation, such as a neutron skin resonance, as well as the difficulty of its measurement near the neutron separation energy. The large number of levels up to the neutron separation energy, a region of particular interest in the calculation of nuclear reaction probabilities, causes detailed and accurate measurements to be close to the threshold of current experimental limits. This talk will begin... more 

Daniel Guest Paul Tipton/Tobias Golling 
A Search for Scalar Charm Quarks with the ATLAS Detector at the LHC This thesis presents the results of a search for pairproduced scalar charm quarks with the ATLAS detector at the LHC. The search uses 20.3 fb^1 of data collected during the sqrt(s) = 8 TeV 2012 run. Each charm quark decays to neutrilinos and charm quarks, resulting in a final state consisting of two charm jets and missing transverse energy. A novel `charm tagging' algorithm was developed to separate this signature from backgrounds, and is discussed in detail. As no evidence of physics... more 

Eric Holland Robert Schoelkopf 
Staff Scientist Lawrence Livermore National Laboratory Cavity State Reservoir Engineering in Circuit Quantum Electrodynamics Engineered quantum systems are poised to revolutionize information science in the near future. A persistent challenge in applied quantum technology is creating controllable, quantum interactions while preventing information loss to the environment, decoherence. In this thesis, we realize mesoscopic superconducting circuits whose macroscopic collective degrees of freedom, such as voltages and currents, behave quantum mechanically. We couple these mesoscopic devices to microwave cavities forming... more 

Emma Ideal Sarah Demers 
Research Scientist, Core Data Science A Search for the Standard Model Higgs Boson Produced in Association with a Vector Boson and Decaying to a HadronicallyDecaying Tau Pair at ATLAS On July 4, 2012, the discovery of the Higgs boson was simultaneously announced by the ATLAS and CMS collaborations. Since then, evidence for its decay to tau leptons has been claimed. As of now, there have been no Higgs discoveries in any of its associated production modes. For this thesis, a search for the Higgs boson produced in association with a vector boson V = W^(+), Z and decaying to a tau lepton pair was conducted using 2012 ATLAS data. The data corresponds to 20.3 fb^(1) of 8 TeV... more 

Peter Koo Simon Mochrie 
Novel opticalbased methods and analyses for elucidating cellular mechanics and dynamics Resolving distinct biochemical interaction states by analyzing the diffusive behaviors of individual protein trajectories is challenging due to the limited statistics provided by short trajectories and experimental noise sources, which are intimately coupled into each protein’s localization. In the first part of this thesis defense, I will describe a novel, machinelearning based classification methodology, called perturbation expectationmaximization (pEM), which simultaneously analyzes... more 

Daliang Li Witold Skiba 
Postdoctoral Associate Harvard University Covariant Methods for Superconformal Field Theories In this thesis, we develop manifestly covariant methods for 4 dimensional, N = 1 superconformal field theories. First, we generalize the embedding formalism in conformal field theories (CFTs) to N = 1 superconformal field theories (SCFTs). As applications we construct manifestly superconformally covariant expressions for 2 and 3point correlation functions involving the supercurrent multiplet or the global symmetry current superfield. Next, we combine this superembedding formalism with the... more 

Tudor Petrescu Karyn Le Hur 
Topological phases with ultracold atoms and photons In the first part of the talk, we introduce two–dimensional lattice tight–binding models that realize the quantum anomalous Hall effect (QAHE). For a Kagome lattice whose degrees of freedom are photons in microwave resonators, we discuss protocols to access the local Berry curvature and the Chern number of Bloch bands from the semiclassical dynamics of wavepackets. We proceed to Haldane’s model for QAHE on the honeycomb lattice, but with repulsively interacting bosons at unit... more 

Brian Vlastakis Robert Schoelkopf 
Controlling coherent state superpositions with superconducting circuits Quantum computation requires a large yet controllable Hilbert space. While many implementations use discrete quantum variables such as the energy states of a twolevel system to encode quantum information, continuous variables could allow access to a larger computational space while minimizing the amount of required hardware. With a toolset of conditional qubitphoton logic, we encode quantum information into the amplitude and phase of coherent state superpositions in a resonator, also known as... more 
Tomas Aronsson John Harris 
Cross section of bottom electrons in protonproton collisions in the ALICE experiment Highenergy heavyion collisions at the LHC allow for the study of the properties of the quarkgluon plasma (QGP). Heavy quarks, charm and bottom, produced in the initial hard scattering processes of the collision are excellent probes of the QGP. When heavy quarks traverse the QGP they are expected to lose energy and such energy loss is predicted to be smaller than for gluons and light quarks. On the other hand, recent experimental data indicate larger energy loss than expected. Heavy flavor... more 